Ink jet printing apparatus and printing method

摘要

An ink jet printing apparatus and printing method are provided that can, without the addition of a special structure, suppress density imbalance between the print images formed by ink ejected from each of the ejection ports formed on a print head. As for the plurality of ejection ports, one portion of them are established as multiple impact ejection ports that form multiply impacted pixels at which the number of times ink is impacted at the same area is greater than at other pixels of the print area. And, print control is carried out such that more multiply impacted pixels are printed at print areas printed using ejection ports at the ends of the print head than at print areas printed without using ejection ports at the ends of the print head.

主权项

1. An ink jet printing method for printing an image on a print medium by ejecting ink from a print head, on which a plurality of ejection ports are aligned, based on print permitting ratios which indicate whether or not ejection of ink is permitted, comprising the steps of:
printing a first part of the image with a plurality of scans of the print head to a first area on the print medium by using ejection ports located at ends of the print head in at least one scan; and printing a second part of the image with a plurality of scans of the print head to a second area on the print medium without using ejection ports located at the ends of the print head, wherein a sum of the print permitting ratios in the plurality of scans to the first area is larger than a sum of the print permitting ratios in the plurality of scans to the second area.